Any analytic signal f (a) (e(it) ) can be written as a product of its minimum-phase signal part (the outer function part) and its all-phase signal part (the inner function part). Due to importance of such decomposition, Kumarasan and Rao (1999), implementing the idea of the SzegA limit theorem (see below), propose an algorithm to obtain approximations of the minimum-phase signal of a polynomial analytic signal